This NodeJS SDK is a Maxmind GEO Lookup. The MaxMind GeoIP2 Database Reader and Web Service Client lets you discover information about a specific IP address and provides web services, subscription-based downloadable databases, and free downloadable databases. MaxMind provides IP intelligence services that prevent online fraud.
Kasabi has just moved into public beta. The private beta is over, and Kasabi is openly ready and willing to become your data marketplace. This is similar to what the primates over at InfoChimps are doing: building a community around data sets and APIs. The Kasabi API collection feels like a first attempt at standardizing the task of designing an API for accessing a dataset.